Do you mean Google Safe Browsing? If so, it looks like the URLs are hashed which preserves some privacy. So if you hit an unsafe URL, you can assume that the folks maintaining the list would know which URL you actually hit, but otherwise you're just sending a hash.<p>More: <a href="https://en.wikipedia.org/wiki/Google_Safe_Browsing#Privacy" rel="nofollow">https://en.wikipedia.org/wiki/Google_Safe_Browsing#Privacy</a>